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SP7606ER-L Datasheet(PDF) 5 Page - Exar Corporation

Part # SP7606ER-L
Description  Wide Input Voltage Boost Controller
Download  17 Pages
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

SP7606ER-L Datasheet(HTML) 5 Page - Exar Corporation

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SP7606
12/17/07 rev: A
SP7600
©Copyright 2007 Exar Corporation
EXAR RESERVES THE RIGHT TO MAKE CHANGES TO THIS DATASHEET. CALL FOR UPDATES: 1-510-668-7000
page
5 of 17
CIRCUIT DESCRIPTION THEORY OF OPERATION
The SP7606 converter is a voltage mode boost
controller. The control loop has built in Type 2
compensation coupled with high switching
frequency allows the user to use small
components when designing the output filter.
The
equations
below
show
generic
relationships as applicable to the boost
regulator running in discontinuous conduction
mode (DCM) and continuous conduction mode
(CCM) of operation.
Duty Cycle in continuous conduction mode
(CCM)
 
Where
Vd= Forward voltage drop of D1
Duty Cycle in discontinuous conduction mode
(DCM)
 
    
Where fsw is the switching frequency
L is the inductor
Re is the effective resistance of the small
signal model
Re can be found by using as follows:
Setting the output voltage
The output voltage of the SP7606 can be set
by using an output voltage divider. The internal
reference of this part is set to 0.8V. Due to the
internal compensation, resistor R1 might need
to be chosen according to the desired gain of
the compensation loop. This resistor is
typically between 100K and 1M ohm. Resistor
R2 can be determined by:
Vfb=800mV Feedback Voltage
R1=Top Voltage divider resistor
R2=Bottom Voltage divide resistor
200=the typical impedance of the DD
FET
For typical applications resistor R1 should be
connected between Vout and the DD pin. The
DD pin serves as a disconnect for the output
voltage divider when the SP7606 is disabled.
This feature allows the user to save power
when the converter is not running. The typical
Impedance of the DD FET when enabled is
200 ohms. If the DD pin is not used the resistor
R1 can be connected directly to the Vfb pin to
get the proper output voltage. If this type of
connection is used the Rdson of the DD Fet
can be ignored and the equation becomes:
Vfb=800mV Feedback Voltage
R1=Top Voltage divider resistor
R2=Bottom Voltage divide resistor
If the DD pin is not used the converter can be
used to boost voltages beyond 38V. A more
detailed discussion on this topic can be found
in the section “High Voltages Operation”. A 10
to 22pf decoupling capacitor from the feedback
pin to ground is recommended when the
SP7606 is used with resistor values above 20K
in the voltage divider circuit.


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